Java后台开发之表单提交之前验证

时间:2022-09-10 11:33:25

废话不多说了,具体代码如下所示:

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<%@ page language="java" contentType="text/html; charset=UTF-8"
  pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<%@ page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>表单提交</title>
  </head>
  <body>
    <p align="center"><b>表单提交</b><br></p>
    <center>
      <div align="left">
        <table height="60" border="0" align="left">
          <tr>
            <td>
              <form name="channelform" action="addChannel.jsp"
               onsubmit="return validate_channel_info(this);" method="post">
                名字: 
                <input type="text" name="channelname" />
                <br />
                ID: 
                <input type="text" name="channelid" />
                <br />
                <input type="submit" value="提交">                 
              </form>
            </td>
          </tr>
        </table>       
         
        <script type="text/javascript">
          function validate_channel_info(channelform)
          {
            if(channelform.channelname.value=="")
            {
              alert("请输入正确的名字");
              return false;
            }
            else if(!isNumber(channelform.channelid.value))
            {
              alert("请输入合法ID");
              return false;
            }
            return true;
          
          function isNumber(str)     // 判断是否为非负整数
          {
            var rx = /^[0-9]+$/;
            return rx.test(str);
          }
        </script>
      </div>
    </center>
  </body>
</html>

以上所述是小编给大家介绍的Java后台开发之表单提交之前验证,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!

原文链接:http://blog.csdn.net/dreams_deng/article/details/54863388